Savington

iTrader: (31)

A couple of people have asked me for a step-by-step on how to quickly wire brake rotors for safety wire. The rotors here are our 11.75" Wilwood rotors, so the exact hardware on your rotor may not look the same, but the theory and some of the technique will still apply.

The goal of safety wire is to stretch a piece of wire tautly between two bolts in such a way that if either bolt were to loosen, the wire would grow more taut. Think of each bolt as a clock: if you run wire from 5o'clock on the left bolt to 10o'clock on the right bolt, both bolts can be loosened without disturbing the wire. Not good. If you wire them from 1o'clock to 7o'clock, neither bolt can be loosened. This is the most important thing to get right when you safety wire anything - if you wire in the wrong direction, you may as well not do it at all.

The only special tool you need to do safety wire is a pair of safety wire pliers. You can spend as little as $20 from Harbor Freight for a pair. You can do it with vise grips or even just a pair of needlenose, but it will take much, much longer. Buy the right tool for the job

I've drawn the orientation of the hole through the head of the bolt with a black sharpie marker so you can easily see it.

I start by deciding on the path of the wire. In some cases, I'll be able to run directly from the 1 or 2 o'clock position to the 7-8o'clock position. Sometimes I'll need to start as far away as the 10 o'clock position on the left and wrap the wire all the way around to the 4 o'clock position on the right in order to maintain the correct wire path between the two bolts. In this case, I've chosen a fairly easy one just to demonstrate the technique. I'll show a more complex one later on.

I size the wire by threading through the backside of the hole I want to come out, routing along the appropriate wire path, and then laying it over the top of the bolt I'll be finishing on. Give yourself at least two extra inches beyond the end of the second bolt - more wire is better, but don't leave too much or it will get in the way when you twist the wire using the safety wire pliers.



I then match the other side of the wire to this length. It's important to wrap the wire around the top side of the left bolt.





Clamp the wire at the intersection between the hole and the wire at approximately a right angle. You can err slightly on the short side, but don't go too short or you'll end up with an unattractive untwisted portion between the two bolts.



Once you've clamped, and you're sure the wire is routed over the top of the left-side bolt, give several twists on the pliers. My pliers typically get 7-8 twists between bolts, depending on the length of wire I'm twisting.



Separate the two ends of the wire and route whichever wire is on top through the hole. Route the wire on the bottom around the bottom of the right-hand bolt.





Clamp the wire about 1" past the end of the second bolt, and twist the wire backwards or counterclockwise. High-end safety wire pliers are reversible, but you can do this short portion by hand pretty easily with a cheap pair of pliers. The backward twist ensures that the wire stays wrapped around the bottom of the second bolt, instead of being rolled over onto the top side as the wire is twisted up.





Clip the excess wires, leaving around 1" left. Grab it about 2/3 of the way away from the bolt, then fold the short portion over the top of the long portion. This keeps the sharp edge of the wire away from your hands while you're installing the rotor, and it just looks pretty.





And we're done! Only 7 more pairs to go!



Here's a more complex example. In this pair, the two bolts don't provide as clear a path from the top left to the bottom right. In this case, I'll start at the 11o'clock position and wrap down and around to the 5o'clock position.



Here you can see where I clamp the wire for this example - right at the intersection between the hole and the wire.



Here's the final path with the first twist done (it's upside down now)



Hopefully this is helpful to those of you who are swapping your own rotor rings. If this looks wildly complex or over your head, no need to worry - for Trackspeed customers, just cut the old wire off and ship your hats and bolts back to me and I'll install new rings and wire on your hats for $100 per pair (including rotors).

EO2K

iTrader: (37)

OK, this is awesome, thank you for the walkthrough with pics!

Could you possibly speak to the various materials for wires and fasteners? Also the relationship between hole size and wire size? Im thinking this might benifit those of us who are planning to do something silly like drill stock chra to turbine housing bolts for safety wire.

I regret I have but one prop to give for this post. Feels a bit sticky

Savington

iTrader: (31)

Wire is 304SS 0.032". 0.028" is available and easier to work with, so long as you don't break it by wrapping it too tight. Available at any motorcycle supply shop (Cycle Gear, etc). Fasteners come with our kit

Leafy

iTrader: (1)

Buy the bolts. $20 for 4 bolts is better than $15 on drill bits, 3 hours of your time, and the brain aneurysm you're going to wish you had rather than trying to drill the bolts. Especially if you dont have a drill press.

gesso

iTrader: (1)

Agreed about the props for a great post, I had the general idea before but this makes it very clear.

acedeuce802

iTrader: (1)

Safety wire is awesome, it really builds character when you have to safety wire bolts in very tight spaces.

EO2K

iTrader: (37)

Already have bolts, drill press, 12 pack of cobalt 0.040" drills & brain aneurysm. Sounds like all I'm missing is some wire and a pair of nifty pliers

Savington

iTrader: (31)

Strong Source / Drilled Head Bolts

Leafy

iTrader: (1)

z31maniac

Thanks for the link. Now I need to go back and look up the specs on the 11" kit to see if something works.

I'd feel better with them safety wired vs the Loctite button head screws that come with the kit.

Which Resbond formula do you use?

Savington

iTrader: (31)

907TS

GraemeD

iTrader: (1)

after years and many cans of safety wire, this makes like much easier. https://www.dmctools.com/Products/safe-t-cable.html

Doppelgänger

iTrader: (12)

I bought safety wire and a safety-wire tool from Harbor Freight. Worked perfectly.

If you've never used safety wire pliers, here is an excellent demonstration...

comradefks

iTrader: (3)

How hard would it be to make a list for something like "these are the parts you should safety wire when going racing"?

acedeuce802

iTrader: (1)

I'm not so sure about the common failure parts of hard tracked Miatas, but in FSAE we have a general rule of failures. If something breaks, does the vehicle roll to a stop, skid to a stop, or come to a screeching halt? If it's either of the latter two, it's a critical fastener and it needs some kind of positive lock. Whether that be safety wire, nylock nut (or some kind of self locking nut), or thread locker. Well, thread locker isn't acceptable for FSAE, but as long as it's not in a high heat area, it's good for me.

ACiFiC

this is pretty cool, ive actually witnessed one of these 2pc rotors fail, so it could save you money in the end

kenzo42

iTrader: (6)

Nice write up, Sav. Thanks.

I know you mentioned the reverse twist (I can see that helping), but I still can't see how that completely prevents the wire from slipping over the smooth side to the top of the bolt, effectively making the wire not taut anymore. I know it works, just wondering if it ever slips with so little friction.

bigben

Did a LOT of safety wire in fsae, and trust me, when it is done correctly, it won't slip over.

Ben

k24madness

iTrader: (6)

After seeing one of these bolts back out on a forum members car I was sold on the concept. It's not that hard to do and if you struggle with it stop by a motorcycle shop and have them do it for you. Work the piece on mind for sure.

Great write up Sav!

joyrider

iTrader: (8)

Where did you get those from? Seems perfect!